7210 AC angular ball bearings. External axial force Fs=0.68Fr. Radius force fr1=3000N, Fr2=1000 N, axial force FA=800N speed n=1200r/min, operating temperature less than 120c ft=1.5, medium impact, fp=1.4. Determine the life of bearing Lh

there are no contact forces mentioned on the list of choices that you've provided.

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.